/Engine/Source/Runtime/Engine/Public/Animation/AnimCurveTypes.h
This doesn't blend but combines MAX(current value, CurveToCombine value)
template<typename OtherAllocator, typename OtherElementType> void UseMaxValue ( const [TBaseBlendedCurve](API\Runtime\Engine\Animation\TBaseBlendedCurve)< OtherAllocator, OtherElementType > & CurveToCombine )